Peer-to-peer (P2P)

Peer-to-peer (P2P for short, roughly ‘between equals’) describes a network of equal participants without a central server. The computers connect directly with one another.

P2P in Bitcoin

The whitepaperGlossaryWhitepaper (Bitcoin whitepaper)The nine-page founding document in which Satoshi Nakamoto introduced Bitcoin on 31 October 2008. It explains how payments can work without a bank and how double spending is prevented.In the glossary →× carries the principle in its title: ‘A Peer-to-Peer Electronic Cash System’. Online payments are meant to go directly from one party to another, without a financial institution in between.^[1]

Your wallet hands a transaction to a nodeGlossaryNodeA computer that runs Bitcoin software and exchanges transactions and blocks with other nodes. Together, the nodes form the Bitcoin network; full nodes check every rule themselves.On the learning path: Stage 1 · Step 3 – How does Bitcoin work? →In the glossary →×. That node passes it on to the nodes it is connected to until the whole network knows it; new blocks spread the same way. Bitcoin Core, for example, connects to this network, downloads blocks and transactions and fully validates them.^[2]

Why this matters

• No single point of failure: if one node goes down, the others keep working.
• Hard to censor: no central authority can block individual payments.
• Open to everyone: you don’t need anyone’s permission to run a node.

Not to be confused with the ‘P2P’ you meet when buying: there it means direct trading between private individuals, see P2P tradingGlossaryP2P trading (peer-to-peer trading)Buying or selling bitcoin directly between private individuals, often via software that locks the bitcoin in an escrow address until the payment arrives. More privacy, but more effort and scam risks of its own.On the learning path: Stage 6 · Step 2 – Spotting scams →In the glossary →×.